Google Professional Cloud Developer Question 312
Select 3Google Cloud PlatformYou are developing a web application hosted on Google Cloud and want to implement A/B testing for a new feature to optimize user experience. The feature should be rolled out to 50% of users while the rest see the current version. Which of the following steps should you take to implement A/B testing effectively and analyze the results?
- A
Use Cloud Load Balancing to route traffic based on user cookies or headers.
- B
Instrument your application with Google Analytics to track user interactions and collect data for both groups.
- C
Use a Cloud Pub/Sub topic to randomly assign users to different groups.
- D
Store user group assignments in Firestore to ensure consistency across sessions.
- E
Set up Cloud Spanner to automatically differentiate traffic between A and B versions.
Show answer and explanation
Correct answers: A, B, D
Explanation
A/B testing requires careful traffic routing, data collection, and assignment persistence. Cloud Load Balancing ensures traffic is split appropriately, Google Analytics collects critical performance metrics, and Firestore provides a persistent storage solution for user group assignments. These tools together enable an effective A/B testing process. Cloud Pub/Sub and Cloud Spanner, while useful in other contexts, are not suitable for A/B testing purposes as described in this scenario.
- A. Correct.
Correct. Cloud Load Balancing can handle traffic routing based on cookies or custom headers, which is essential for directing users to the different A/B versions effectively.
- B. Correct.
Correct. Google Analytics is a robust tool for tracking user interactions and gathering data to analyze the performance of each version in the A/B test.
- C. Incorrect.
Incorrect. While Cloud Pub/Sub is a great messaging tool, it is not suitable for assigning users to A/B testing groups because it does not persist user state across sessions.
- D. Correct.
Correct. Storing user group assignments in Firestore ensures that users remain in the same group across multiple sessions, which is critical for a consistent A/B testing experience.
- E. Incorrect.
Incorrect. Cloud Spanner is a globally distributed database and is not designed to differentiate or route traffic between A/B test groups.